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17 March 2015 A real-time 3D range image sensor based on a novel tip-tilt-piston micromirror and dual frequency phase shifting
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Proceedings Volume 9393, Three-Dimensional Image Processing, Measurement (3DIPM), and Applications 2015; 93930A (2015) https://doi.org/10.1117/12.2078976
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States
Abstract
Structured light is a robust and accurate method for 3D range imaging in which one or more light patterns are projected onto the scene and observed with an off-axis camera. Commercial sensors typically utilize DMD- or LCD-based LED projectors, which produce good results but have a number of drawbacks, e.g. limited speed, limited depth of focus, large sensitivity to ambient light and somewhat low light efficiency.

We present a 3D imaging system based on a laser light source and a novel tip-tilt-piston micro-mirror. Optical interference is utilized to create sinusoidal fringe patterns. The setup allows fast and easy control of both the frequency and the phase of the fringe patterns by altering the axes of the micro-mirror. For 3D reconstruction we have adapted a Dual Frequency Phase Shifting method which gives robust range measurements with sub-millimeter accuracy.

The use of interference for generating sine patterns provides high light efficiency and good focusing properties. The use of a laser and a bandpass filter allows easy removal of ambient light. The fast response of the micro-mirror in combination with a high-speed camera and real-time processing on the GPU allows highly accurate 3D range image acquisition at video rates.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Øystein Skotheim, Henrik Schumann-Olsen, Jostein Thorstensen, Anna N. Kim, Matthieu Lacolle, Karl-Henrik Haugholt, and Thor Bakke "A real-time 3D range image sensor based on a novel tip-tilt-piston micromirror and dual frequency phase shifting", Proc. SPIE 9393, Three-Dimensional Image Processing, Measurement (3DIPM), and Applications 2015, 93930A (17 March 2015); https://doi.org/10.1117/12.2078976
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